#include <Wire.h>
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>

#define ROW_NUM     4 // define numero de filas
#define COLUMN_NUM  4 // define numero de columnas

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','4','7','*'},
  {'2','5','8','0'},
  {'3','8','9','#'},
  {'A','B','C','D'}
};

byte pin_rows[ROW_NUM]      = {17, 5, 18, 19};  //{19, 18, 5, 17} pines correspondientes a las filas GIOP19, GIOP18, GIOP5, GIOP17 
byte pin_column[COLUMN_NUM] = {15, 2, 4, 16};   //{16, 0, 2, 15} pines correspondientes a las columnas GIOP16, GIOP4, GIOP0, GIOP2  
                                                //{16, 4, 2, 15} pines correspondientes a las columnas GIOP16, GIOP4, GIOP2, GIOP15
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 16 column and 2 rows

int cursorColumn = 0;

void setup(){
  lcd.init(); // initialize the lcd
  lcd.backlight();
}

void loop(){
  char key = keypad.getKey();

  if (key) {
    lcd.setCursor(cursorColumn, 0); // move cursor to   (cursorColumn, 0)
    lcd.print(key);                 // print key at (cursorColumn, 0)

    cursorColumn++;                 // move cursor to next position
    if(cursorColumn == 21) {        // if reaching limit, clear LCD
      lcd.clear();
      cursorColumn = 0;
    }
  }
}